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bug#8961: stdbuf has no effect on some programs
From: |
Pádraig Brady |
Subject: |
bug#8961: stdbuf has no effect on some programs |
Date: |
Thu, 30 Jun 2011 00:29:22 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 |
On 30/06/11 00:05, Pádraig Brady wrote:
> On 29/06/11 21:59, Bruno Haible wrote:
>> Hi,
>>
>> The glibc 'iconv' program buffers its input, and some people don't like this.
>> I thought that the 'stdbuf' program could remove the buffering, but it does
>> not
>> work.
>
> The following shows I think that iconv is bypassing stdio and buffering
> internally?
>
> (echo; sleep 3; echo) | ltrace iconv -f ASCII
>
> The stdbuf man page notes that:
>
> NOTE: If COMMAND adjusts the buffering of its standard streams (`tee'
> does for e.g.) then that will override corresponding settings changed
> by `stdbuf'. Also some filters (like `dd' and `cat' etc.) don't use
> streams for I/O, and are thus unaffected by `stdbuf' settings.
In fact iconv seems to buffer for ever and so it not scalable,
as demonstrated with this consuming all of memory:
yes | iconv
It would be OK to treat '\n' simply in all
unibyte encodings and utf8 for example,
but that would introduce an inconsistency I suppose.
Though maybe iconv could employ more scalable
buffering at least, for all encodings?
cheers,
Pádraig.